Pneumatic drill.



G.- H. GILMAN. PNEUMATIC DRILL. APPLICATION HLEQ MAY 28, 1914.

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Patnted Aug. 17, 1915,

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. with the tool, so that the Drills,

GEORGE H. GILMAN, OF- CLAREMONT,

NEW HAMPSHIRE, ASSIGNOR T0 SULLIVAN MACHINERY COMPANY, OF CLAREMONT, NEWHAMPSHIRE, A CORPORATION OF MASSACHUSETTS.

PNEUMATIC DRILL.

Specification of Letters Patent.

Patented Aug. 1'3, 1915.

Application filed May 28, 1914. Serial No. 841,615.

positively fed by the screw of the support or may be operatedindependently thereof .as desired.

I The character of the invention will be best understood by reference tothe following description when taken in connection with the accompanyingdrawings of one illustrative embodiment thereof, While its scope willbemore particularly pointed out in the appended claims.

i In the drawings: Figure 1 is a plan view.

of a hand drill and a support therefor illustrating one embodiment ofthe invention; Fig. 2 is a view in side elevation and partially invertical section of the tool and support shown in Fig. 1; Fig. 3 is aplan view on a scale larger than shown in Figs. 1 and 20f a cradleforming part of the support for the tool. nal section through the cradleshown in Fig. 3; and Fig. 5 on an enlarged scale is a transverse rectiontaken on line 55 of Fig. 2 with the tool removed.

Referring to the drawings and tothe embodiment of my invention which Ihave selected for illustrative purposes, I have hammer which deliversthe inne vend of a drill bit 5. The latter is mounted in an elongatedcylinder head 7 preferably supported in a yielding manner on vtheforward end of the cylinder 3 by means ofa pair of tie rods 9, 9 andcushioning springs 11 11. To arrest'forward movement of the drill bitwhen [struck by the piston hammer there is provided a tool retainer orstop 13 of any suitable construcor saddle 25 shown herein Fig. 4: is avertical longitudithere is provided a swing tion. The tool is providedwith a handle 15 formed to present an elongated eye 17 be-, tween saidhandle and the rear cylinder head 19.

At times the tool described is adapted to be held manually in operationand at other times it may be desired to provide a support for the tooland feed the same positively relatively to the work by a feed screw. The

support shown herein comprises a shell 21' having a trunnion 23depending therefrom and detachably connected to a usual clamp asconnected to a column 33, although obviously the trunnion may beconnected to a tripod if desired.

Journaled in the shell 21 is a feed screw 35 adapted to be turned by ahandle 37. Theshell is provided with ways 39, 39 receiving slide flanges41, 41 of the cradle. Depending from the cradle is an eye l3 receiving anut 4-5 threaded to the feed screw 35. WVhen the feed screw is turned byits .handle the'nut and cradle are caused to travel longitudinallythereof.

An important feature of the invention relates to the construction of thecradle whereby the tool may be, readily detachahly connected thereto. Toaccomplish this the cradle is provided with a head 4.7 projectingupwardly therefrom and formed to present a fixed jaw. 49 to which amovable jaw 51 is hinged by a pin hf'lextenl'ling through registeringapertures in cars on said jaws. To lock the upper jaw in closed positionbolt pivoted to the'head 47 and received in an open slot in the upperjaw, said bolt being held therein by a thumb nut 57. The head 47 isprovided with inclined portions 59 against which the rear head 19 of thetool is adapted to rest, as more fully hereinafter described. The cradlealso is provided with a seat 60 curved to conform to the contour of thetool and having an incline 61 for engagement with a correspondinglyinclined portion of the tOol.

The tool is placed on the cradlewith its handle resting in the lower jaw49 and the upper jaw 51 entered through the handle draws the handletightlyagainst rests on the inclines 59 and 61 it tends to rideforwardly on its saddle and in so doing the throat of the clamp jaws.The aws are formed to conform to the contour of the handle aperture andthereby tightly grip a substantial extent of the handle and in so doingprevent any rotation of the body of the tool in the cradle and securelyretain the same in the head of the cylinder to further contribute to theholding of the tool in its proper position. After the tool has beensecured to its cradle it may be positively fed relatively to the work byturning the feed screw 35.

If it is desired to remove the tool and support and operate thesamemanually, it is simply necessary to release the single swing bolt andopen the jaws. tree to be lifted from the cradle.

While the tool is shown herein within its handle in horizontal position,it will be understood that the cradle may support the tool with itshandle in vertical position if desired.

Having described one illustrative embodiment of the invention withoutlimiting the same thereto, what I claim as new and desire to secure byLetters Patent is:

1. In combination, a percussive tool having a body and a handle providedwith an opening, a supporting cradle for the tool,

said cradle being provided with a handlesupporting head comprising fixedand movable jaws, one of which enters the opening in the handle, andmeans to hold said jaws in handle-engaging relation.

2. In combination, a percussive tool having a body and a handle providedwith an opening, a supporting cradle for the tool, said cradle beingprovided with. a handlereceiving head comprising two jaws relativelymovable with respect to each other,

one of said jaws being adapted to enter said opening, and means to holdsaid jaws 1n handle-engaging relation.

3. In combination, a percussive tool having a body and a handle providedwith an opening, a supporting cradle for the tool, said cradle having amember to support said handle in a position transversely of the cradle,and a coperating member adapted to pass through the opening of saidhandle and to coiipcratc with said handle support- The tool is then apercussive tool havsaid cradle haying two members pivoted together andadapted to receive said handle between them, one of said members passingthrough the opening.

5. In combination, ing a body and a handle provided with an opening, asupporting cradle for the tool, said cradle having a member-to supportsaid handle in a position transversely of the cradle, a cooperatingmember adapted and a handle provided with an.

a percussive tool hav to passvthrough the opening of said handle and tocooperate with said handle supporting means in maintaining said handlein position, and cooperating means to support the body of the tool.

6. In combination, a percussive tool having a body and a handle providedwith an opening, a supporting cradle for said tool, said cradle havingtwo members pivoted together and adapted to receive a handle betweenthem, one of said members passing through the opening, and cotiperatingmeans to support the body of the tool.

7. In combination, ing a body and a handle, a supporting cradle havinghandle and body supports for the tool, one at least of said supportshaving a fprwardly extending incline to receive the too 8. Incombination, a percussive tool having a body and a handle, a supportingcradle having handle and. body supports for the tool, each of saidsupports having a forwardly extending incline to receive the tool, andone of said supports having means to clamp the tool thereto.

9. In combination, a percussive tool having a body and a handle 15provided with an opening 17, a supporting cradle-for said tool having atool supporting head 47 provided with a handle receiving seat and acooperating jaw 51.

10. In combination, a percussive tool hava percussive tool haviio

